Ruler



FIG. 1 is a front, right, top perspective view of a ruler, showing our new design;

FIG. 2 is a front elevation view thereof,

FIG. 3 is a rear elevation view thereof,

FIG. 4 is a top view thereof,

FIG. 5 is a bottom elevation view thereof,

FIG. 6 is a left side view thereof; and,

FIG. 7 is a right side view thereof. 

The ornamental design for a ruler, as shown and described. 